6669986 has 8 divisors (see below), whose sum is σ = 10032924. Its totient is φ = 3325680.

The previous prime is 6669983. The next prime is 6670019. The reversal of 6669986 is 6899666.

It can be written as a sum of positive squares in 2 ways, for example, as 6599761 + 70225 = 2569^2 + 265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6669983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3725 + ... + 5216.

Almost surely, 2^6669986 is an apocalyptic number.

6669986 is a deficient number, since it is larger than the sum of its proper divisors (3362938).

6669986 is a wasteful number, since it uses less digits than its factorization.

6669986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316.

The product of its digits is 839808, while the sum is 50.

The square root of 6669986 is about 2582.6316036167. The cubic root of 6669986 is about 188.2384367161.

The spelling of 6669986 in words is "six million, six hundred sixty-nine thousand, nine hundred eighty-six".